I play Luigi. I also sometimes throw in Ike. Who do you guys play?
For what game? I see it says Project M and Melee are Luigi, and Brawl is Ike, but I'm assuming you use Ike in PM.
Melee: I kinda have a lot of characters depending on the matchup. For Marth, I'd like to use my main (who I'll say later), but the Marth ditto seems like a better option atm. For IC's, I dunno. I could use my main, but Fox seems like a good option too. For floaties (Samus, Peach, Puff), I'll use Doc. For everyone else, I'll use Mario, my real main. He's got so much untapped potential that I'd really like to show, and I think that having a Doc and a Mario interchangeable is better than having one as a separate main.
My bro is a Marth main, and it's definitely the matchup I know the most. He has a decent Puff and can rest really well. He's been working on Doc lately and has an okay Sheik and Falcon, but is mostly Marth.
Project M: I've only played this game for like 5 hours at my friend's house, which is in Dix Hills, so it's hard to get plans with him considering we're juniors in high school and we're busy as shiet. He may come with me the same day I will (uses Lucas and Kirby in PM, IC's and Zelda in melee, I think Sheik in Smash 4). I tested every character, and from what I've played, Mario, Luigi, Lucario, Mewtwo, Marth, and Fox. If I do end up entering PM, I'll just transfer my Mario Melee knowledge to that game, since he's a lot better in Project M.
I dunno who my bro would use (he's never played it), but maybe Marth or Falcon.
Smash 4: Captain Falcon and Luigi are easily my best. I have a lot of decent secondaries, and I use Duck Hunt and Ness in doubles sometimes..
My bro uses a lot of characters. His mains are more Dedede and Villager, but he also uses Doc, Mario, DK, Pikachu, etc. He also uses Falco and Ness in doubles sometimes.